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I have a 2001 alero 3.4 6cyl. It runs poor when it first starts in cold weather but every so often it decides not to start at all. I can always tell when it's going to happen because the tachometer st

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  • Cars & Trucks Master
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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 02, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2001 Olds Alero Wouldn't Start

I had a problem similar recently, just wouldn't stay on. Found out that there is a flaw with the sensors on those cars for the ignition "talking" to the computer's Passlock II thing. The car thinks it's getting stolen so it engages the anti-theft which turns off the fuel injection. You just have to reset the Passlock. Turn the key to the first On position where you have radio but no windows, leave it for 10 minutes until the little Security light turns off. Turn off the key then start it.
Don't know if it was your problem, but just so you know, the sensor part will eventually start failing with this car.

Posted on Jul 18, 2008

bibleman01
  • 334 Answers

SOURCE: 2001 Chevy Blazer has check engine light on and hard to start.

Try IAC the idle air control because its what compensates a rich or lean mixture. There is another sensor called ECT sensor which reads off the tempature of the coolant

Posted on Jan 05, 2009

george460
  • 1 Answer

SOURCE: my mercedes e300 (1989) starts and runs ok but then cuts out.

I had a similar problem with my 1986 300e , which got progressively worse until the car was no longer driveable, I changed out the fuel pump relay and the problem went away.

Posted on Jun 28, 2009

DIESELMUDDER
  • 2760 Answers

SOURCE: 2001 f250 7.3 diesel cold weather starting

this sounds like a fuel contamination problem Assuming you have allready ck that glow plugs are all working add a few cans of dewater to tank and drive it a bit change fuel supplier

a simple way to see if glow plugs are even trying to work is right after wait to start lite goes out look at voltmeter on dash if it's not bouncing a bit there not working

glow plugs preheat the combustion chamber so cold fuel will fire off

also that truck might also have the fuel heater internal to filter housing
installed that might be burnt out as well OHM meter will tell you if so

Posted on Oct 07, 2009

  • 5 Answers

SOURCE: Volvo v50 2.0D with a cold start problem

mines got same problem

Posted on Jan 23, 2010

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2 Answers

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Did you check to see if fuel is getting to injectors on cold startup! If you have starting problems and the "check engine" light doesn't come on, you may have a bad engine coolant temperature sensor (ECT). Good-Day

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